Re: [PATCH v8 2/9] pci: Export find_pci_host_bridge() function.

[Arnd Bergmann <arnd@arndb.de>]

On Wednesday 02 July 2014 11:06:38 Tanmay Inamdar wrote:
> On Tue, Jul 1, 2014 at 11:43 AM, Liviu Dudau <Liviu.Dudau@arm.com> wrote:
> > This is a useful function and we should make it visible outside the
> > generic PCI code. Export it as a GPL symbol.
> >
> > Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> > Tested-by: Tanmay Inamdar <tinamdar@apm.com>
> > ---
> >  drivers/pci/host-bridge.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> > index 0e5f3c9..36c669e 100644
> > --- a/drivers/pci/host-bridge.c
> > +++ b/drivers/pci/host-bridge.c
> > @@ -16,12 +16,13 @@ static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
> >         return bus;
> >  }
> >
> > -static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
> > +struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
> >  {
> >         struct pci_bus *root_bus = find_pci_root_bus(bus);
> >
> >         return to_pci_host_bridge(root_bus->bridge);
> >  }
> > +EXPORT_SYMBOL_GPL(find_pci_host_bridge);
> 
> Is there any specific reason behind making this symbol GPL? I think
> the other functions in this file are just EXPORT_SYMBOL. Ultimately
> companies which have non gpl Linux modules (nvidia) will face issue
> using this API.
> 
> The same applies to 'of_create_pci_host_bridge'.

I think EXPORT_SYMBOL_GPL() is better here. The new symbols are unlikely
to be used by a peripheral device driver, and PCI host controllers are
already restricted by EXPORT_SYMBOL_GPL.

nvidia will certainly not do a PCI host controller driver that is not
upstream or not GPL-compatible.

	Arnd